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After he finished his high school career in Yokohama, Tazawa was not drafted by any of Nippon Professional Baseball's 12 teams, and joined the company team of Nippon Oil in the corporate league, unaffiliated with the NPB.[3]

In 2008, Tazawa posted a 10-1 record for Nippon Oil, with a 1.02 earned run average and 95 strikeouts in 88 1/3 innings.[3] In the national corporate league championships, Tazawa posted two straight shutouts, the second one a complete game on four hits, 10 strikeouts and zero walks in a 4-0 quarterfinal win over Hitachi, Ltd.[4] He appeared less than 24 hours later in a relief appearance in the semifinal against Central Japan Railway. Tazawa pitched 2 and 2/3 innings, and allowed three hits, struck out one, and gave up the go-ahead run in a 3-2 loss.[5]

In September 2008, Tazawa announced his intention to skip the NPB draft in and to purse a career with a Major League team. During the 2008 season, his manager Hideaki Okubo encouraged him to attempt a career in Major League Baseball without first playing with a Nippon Professional Baseball team - if he joined a Japanese professional team, he would have to either wait 10 years to become a free agent, or hope that his team auction the right to negotiate with him through the posting system.[3]

To avoid conflict between Japanese and U.S. teams, Tazawa asked NPB teams not to select him in the October 30 draft, and the 12 teams complied with the request. However, the teams passed a rule requiring any amateur player who signs overseas to sit out two to three years before he can join a Japanese team - high school players would have to sit two years, while college and corporate players three years.[2] While Tazawa attracted attention of American scouts, NPB announced that the major leagues of two nations had a "gentleman's agreement" against signing Japanese amateurs, while general manager Brian Cashman, whose New York Yankees have a partnership agreement with Yomiuri Giants, said his team considered Tazawa "hands off".[3] However, Rob Manfred, MLB’s executive vice president for labor and human resources denied that any gentleman's agreement was in place regarding the signing of Japanese amateur players. Red Sox general manager Theo Epstein pointed out that there have been approximately 50 Japanese amateur players that in the past have signed with major league teams.[6]